Asset manager · Tokyo, Japan
Asset Management One Co., LTD.
SEC-registered investment adviser · CRD 110843 · SEC 801-55047
At a glance
Asset Management One Co., LTD. is an SEC-registered investment adviser based in Tokyo, Japan, with $470.5 billion in regulatory assets under management as of its Form ADV filed June 29, 2026. Its largest client group by assets is state or municipal government entities. By Form ADV it is a asset manager, ranked 35th of 3,218 asset managers and 52nd of 17,210 SEC-registered advisers by assets.
Main office +81367745000am-one.co.jpAs filed on Form ADV
- Regulatory AUM
- $471B
- Rank among asset managers
- #35 of 3,218
- Rank among all SEC RIAs
- #52 of 17,210
- Clients
- 1,406
- Accounts
- 1,741
- Discretionary
- 100% of AUM
- Employees
- 950
- Advisory staff
- 290
- Offices
- 1
Owners and executives on its Form ADV
- Koya N. IwabuchiExecutive Officer, Deputy Head of Institutional Fiduciary Management Division
- Yusuke N. SasakiDirector, Managing Executive Officer, Head of Strategic Fund Investment Division, Head of Product Division
- Shigeki N. MuramatsuManaging Executive Officer, Head of Investments Division
- Tetsuji N. TodaDirector, Member of Audit and Supervisory Committee
- Masako N. ItoManaging Executive Officer, Deputy-Head of Planning Division
- Noriyuki N. SugiharaDirector, President & Chief Executive Officer
- Takeshi N. MikiManaging Executive Officer, Head of Institutional Fiduciary Management Division
- Nobuyuki N. NagahamaChief Operations Officer, Executive Officer, Head of DX & Process Innovation Division
- Kohei N. HorikawaChief Compliance Officer, Chief Legal Officer, Director, Managing Executive Officer, Head of Risk Management Division
- Hirofumi N. NoguchiManaging Executive Officer, Head of Retail & Wealth Solutions Division
- Hiromichi N. ShimadaExecutive Officer, Deputy Head of Strategic Fund Investments Division
- Akito N. YanagiharaDirector, Member of Audit and Supervisory Committee
Custody and brokerage
2 custodians
- The Master Trust Bank of Japan ,LTD.$202B63%
- Custody Bank of Japan, LTD.Affiliate of the firm$117B37%
Other RIAs using The Master Trust Bank of Japan ,LTD.Other multi-custodian RIAs
Broker-dealer
Affiliated broker-dealer
It names an affiliated broker-dealer: Mizuho Securities Co., LTD..
- Mizuho Securities Co., LTD.
Who it serves
| Client type | Clients | Regulatory AUM | Share |
|---|---|---|---|
| State or municipal government entities | 16 | $249B | 53% |
| Pooled investment vehicles | 942 | $138B | 29% |
| Pension and profit sharing plans | 321 | $56B | 12% |
| Insurance companies | 9 | $9.9B | 2% |
| Sovereign wealth funds and foreign official institutions | 1 | $7.8B | 2% |
| Corporations or other businesses | 59 | $5.0B | 1% |
| Other investment advisers | 11 | $2.2B | <1% |
| Charitable organizations | 30 | $1.9B | <1% |
| Banking or thrift institutions | 17 | $317M | <1% |
Disciplinary disclosures
Asset Management One Co., LTD. answers yes to 3 disclosure items in Item 11 of Form ADV (criminal, regulatory or civil matters involving the firm or its advisory affiliates). Read the details on the SEC’s adviser search ↗
Services
- Portfolio management for pooled investment vehicles
- Portfolio management for businesses and institutions
- Selecting other advisers
- Other services
How it’s paid
- A percentage of assets under management
- Fixed fees
- Performance-based fees
Form ADV and brochures on the SEC’s adviser search ↗am-one.co.jp ↗
AtlasMembers
The full record on Asset Management One Co., LTD.
Ten years of SEC filings, its owners and contacts, and how it stacks up against its peers. Atlas members see all of it.
- Assets, accounts, clients and staff, ten years of filings
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- Growth over one, three and five years
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- Rank against 75 peers of its type and size
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- Owners and executives, with titles and stakes
- 16 namedLocked
- Main office, fax and compliance officer
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- Filing changes this year, with alerts
- 1Locked
Free while Atlas launches: create a free account and confirm your email. Every figure comes from SEC filings.
Background
Questions
How much does Asset Management One Co., LTD. manage?
Asset Management One Co., LTD. reports $470.5 billion in regulatory assets under management across 1,741 accounts, 100% of it on a discretionary basis, on its Form ADV filed June 29, 2026.
What kind of firm is Asset Management One Co., LTD.?
Asset Management One Co., LTD. is a asset manager by its Form ADV answers. Most of its assets are managed for funds, institutions or other businesses rather than individuals. It reports a bank or thrift among its related persons. A public reporting company controls it.
Who are Asset Management One Co., LTD.’s clients?
By assets, its largest client types are state or municipal government entities ($249.2 billion, 16 clients); pooled investment vehicles ($138.1 billion, 942 clients); pension and profit sharing plans ($56.2 billion, 321 clients).
Does Asset Management One Co., LTD. have any disciplinary history?
Asset Management One Co., LTD. answers yes to 3 disclosure items in Item 11 of Form ADV, which covers criminal, regulatory and civil matters involving the firm or its advisory affiliates. The details are on the SEC’s adviser search.
Where these numbers come from
Every figure is Asset Management One Co., LTD.’s own answer on its latest Form ADV, from the SEC’s registered-adviser list as of October 1, 2026: regulatory assets and accounts (Item 5.F), clients by type (5.D), employees (5.A and 5.B), compensation (5.E) and services (5.G). Custodians come from Schedule D 5.K(3) of its latest filing (2026-06-29), which lists those holding 10% or more of separately managed account assets and the amount at each. “Hybrid” means some employees are also registered representatives of a broker-dealer (Item 5.B(2)); affiliated broker-dealers are the related persons it lists in Item 7.A and Schedule D. Firm type comes from its own answers: broker-dealer firms are registered broker-dealers themselves (Item 6.A); private fund advisers manage mostly private funds (Item 7.B, 5.D); wealth managers manage at least half their assets for individuals (5.D). Ranks compare it by regulatory assets with every SEC-registered adviser and with firms of its type. Figures are as of the firm’s last annual update, so they can lag recent deals and market moves. Regulatory AUM counts assets the firm continuously supervises and can differ from what a firm markets.
Not an endorsement or a recommendation. Before hiring any adviser, read its Form ADV Part 2A brochure and check its record on the SEC’s adviser search. How to check a financial advisor →